Dogs act like toddlers when you need help - but cats just watch. Scientists compared 3 groups: pet dogs, cats, and human toddlers in an experiment where a human parent hides and pretends to look for an object. 75% of dogs and children helped. Cats only helped if it was in their personal interest.

· · 来源:answer资讯

* @param arr 待排序数组

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PinkPanthe,详情可参考Line官方版本下载

Раскрыты подробности похищения ребенка в Смоленске09:27

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The new API in action